Map: Here are the Sonoma, Napa county bridges rated ‘poor’

The collapse of a Baltimore bridge this week has renewed interest in bridge conditions locally and around the United States.

Forty-nine of the 767 bridges in Sonoma and Napa counties are considered structurally deficient, according to the U.S. Department of Transportation.

“Just because it is ‘structurally deficient’ doesn’t mean it is going to fall down,” said Johannes Hoevertsz, director of Sonoma County’s public infrastructure department in an interview with The Press Democrat.

Poor condition means there is “advanced section loss, deterioration, spalling or scour,” according to the Federal Highway Administration. Spalling is the breaking of a material into pieces, and scouring is the loss of top bed soil around bridge supports.

This also means the bridges are “structurally deficient,” according to the DOT’s definition updated in 2018. Five bridges in Napa and 23 in Sonoma County are operated by their respective counties, the rest are under either state or federal auspices.

Caltrans inspects all bridges in Sonoma County annually and every two years it looks at bridges spanning more than 20 feet in Napa County. The state agency provides a rating for the bridge and once it is below a specific rating, officials start planning for the bridge to either be rehabilitated or replaced.

Here are the bridges:

Sonoma County

• River Road over the Russian River, a temporary crossing put up in summer months
• State Route 116 over Drake Road
• Trenton Healdsburg Road over Mark West Creek
• Llano Road over Colgan Creek
• Geysers Road over Camacho Creek
• Wohler Road over Mark West Creek
• Mill Creek Road over Mill Creek
• Windsor Road over Pool Creek
• Franz Valley School Road over Franz Creek
• Sartori Drive over Adobe Creek
• State Route 128 over Maacama Creek
• Arnold Drive over Sonoma Creek
• Mill Station Road over the Atascadero Creek overflow
• Highway 101 over Westside Road
• Fir Road over Dutch Bill Creek
• State Route 128 over the Russian River
• Old Redwood Highway over Willow Brook Creek
• Snyder Lane over Crane Creek
• Old Duncans Grade Road over Austin Creek
• Highway 101 southbound over Chiquita Road
• Highway 101 over Dry Creek Road
• Gericke Road over Americano Creek
• Bloomfield Road over Bloomfield Creek
• Highway 101 northbound over First Street and Cloverdale Creek
• State Route 116 over Green Valley Creek
• Santa Rosa Avenue over Colgan Creek
• Wilfred Avenue over Belview-Wilfred Creek
• Green Valley Road over Green Valley Creek
• State Route 12 westbound over Highway 101 and connecting ramps
• Washington Street over the Petaluma River
• River Road over Mark West Creek
• State Route 12 over Hooker Creek
• Railroad Avenue over an unnamed creek
• Sweetwater Springs Road over Porter Creek
• Watmaugh Road over Fowler Creek
• Eighth Street East over Schell Creek
• State Route 12 over Calabazas Creek
• Eagle Nest Lane over Hillside in Guerneville
• Vacation Beach Road over the Russian River, a temporary crossing put up in summer months
• Rover Road over the Russian River
• Pine Flat Road over Sausal Creek

Napa County:

• Dry Creek Road over Dry Creek
• Oak Knoll Avenue over Napa River overflow
• Greenwood Avenue over Garnett Creek
• State Route 29 over the Napa River
• Deer Park Road over the Napa River
• State Route 128 over Hopper Slough
• State Route 29 over Garnett Creek
• Berryessa Knoxville Road over Pope Creek and Lake Berryessa